Method and system for producing interactive, three-dimensional renderings of selected body organs having hollow lumens to enable simulated movement through the lumen
A method and system are provided for effecting interactive, three-dimensional renderings of selected body organs for purposes of medical observation and diagnosis. A series of CT images of the selected body organs are acquired. The series of CT images is stacked to form a three-dimensional volume file. To facilitate interactive three-dimensional rendering, the three-dimensional volume file may be subjected to an optional dataset reduction procedure to reduce pixel resolution and/or to divide the three-dimensional volume file into selected subvolumes. From a selected volume or subvolume, the image of a selected body organ is segmented or isolated. A wireframe model of the segmented organ image is then generated to enable interactive, three-dimensional rendering of the selected organ.
1. A method for interactively displaying three dimensional structures from a three-dimensional volume of data representing at least one physical property associated with a three dimensional body, comprising the steps of:
a) isolating a selected region of interest from the volume of data based on selected values of the physical property representing the isolated region of interest, wherein the step of isolating the selected region of interest comprises a thresholding step for determining threshold values corresponding to the selected the physical property to isolate the selected region of interest; and
b) rendering the isolated region of interest in an interactive three-dimensional display,
wherein the thresholding step comprises a threshold selection step for selecting a threshold range corresponding to the selected values of the physical property representing the region of interest and a threshold adjustment step for adjusting threshold values to establish the threshold range for isolating the region of interest.
2. The method as recited in claim 1 , wherein the threshold adjustment step comprises:
a) an orthoslice step of providing an orthoslice through the volume of data; and
b) a display step for displaying the orthoslice and a corresponding thresholded image of the orthoslice, so that the threshold values can be adjusted while comparing the thresholded image to the corresponding orthoslice.
3. The method as recited in claim 1 , wherein the region of interest comprises an air-tissue interface.
4. The method as recited in claim 3 , wherein the air-tissue interface comprises an air column within a body organ.
5. The method as recited in claim 1 , wherein the region of interest comprises an air-tissue interface.
6. The method as recited in claim 5 , wherein the air-tissue interface comprises an air column within a body organ.
7. The method as recited in claim 1 , comprising simulating movement along a center line through the isolated region of interest.
8. The method as recited in claim 7 , wherein the step of simulating movement along the center line through the isolated region of interest of the three-dimensional display comprises the steps of:
a) selecting a seed point which lies within the region of interest;
b) determining a plane of minimum area through the region of interest that passes through the seed point;
c) determining the center point of the region of interest that is dissected by the plane of minimum area; and
d) selecting a point which is spaced from the center point in a perpendicular direction relative to the plane of minimum area.